From: Laura Flores <lflores@redhat.com>
Date: Fri, 27 May 2022 18:28:19 +0000 (-0500)
Subject: PendingReleaseNotes: add note about `bluestore_zero_block_detection` config option
X-Git-Tag: v18.0.0~799^2
X-Git-Url: http://git-server-git.apps.pok.os.sepia.ceph.com/?a=commitdiff_plain;h=refs%2Fpull%2F46193%2Fhead;p=ceph.git

PendingReleaseNotes: add note about `bluestore_zero_block_detection` config option

Signed-off-by: Laura Flores <lflores@redhat.com>
---

diff --git a/PendingReleaseNotes b/PendingReleaseNotes
index 19833faafcbf..69226a01ec0b 100644
--- a/PendingReleaseNotes
+++ b/PendingReleaseNotes
@@ -43,3 +43,13 @@
   * system
   * truncated
   * user_stats_sync
+
+>=17.2.1
+
+* The "BlueStore zero block detection" feature (first introduced to Quincy in
+https://github.com/ceph/ceph/pull/43337) has been turned off by default with a
+new global configuration called `bluestore_zero_block_detection`. This feature,
+intended for large-scale synthetic testing, does not interact well with some RBD
+and CephFS features. Any side effects experienced in previous Quincy versions
+would no longer occur, provided that the configuration remains set to false.
+Relevant tracker: https://tracker.ceph.com/issues/55521